/ Dictionary / Index R reflex arc: Meaning and Definition of Find definitions for: re'flex arc' Pronunciation: [key] — Physiol. Physiol. the nerve pathways followed by an impulse during a reflex. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. reflex angle reflex camera Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language